I’m still having trouble with it but haven’t had a chance to dig deeper, will report back when I do. Thanks. My hub is running fine and it’s received zaps over the past two days.
I’ve just captured the error I see. 
Discussion
do you use some VPN or something that might block something?
No, it’s a fairly vanilla setup to be honest. I’ve tried adding a serving Alby Go connection and that didn’t work either. I’ll keep playing around.
nostr:npub1xv8mzscll8vvy5rsdw7dcqtd2j268a6yupr6gzqh86f2ulhy9kkqmclk3x I’ve got it working again. Two things, my hub needed an update, so have applied that and I created a new connection. I think when I tried this before it may have failed as the hub needed updating?? Maybe not the case - nonetheless, it’s all good now!